US5472305A - Sealed rotary feeder - Google Patents

Sealed rotary feeder Download PDF

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Publication number
US5472305A
US5472305A US08/093,883 US9388393A US5472305A US 5472305 A US5472305 A US 5472305A US 9388393 A US9388393 A US 9388393A US 5472305 A US5472305 A US 5472305A
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US
United States
Prior art keywords
casing
side plate
rotor
cylindrical surface
chip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/093,883
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English (en)
Inventor
Sadao Ikeda
Makoto Kito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP29155692A external-priority patent/JPH06134760A/ja
Priority claimed from JP29523192A external-priority patent/JPH06143281A/ja
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA reassignment TOYOTA JIDOSHA KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IKEDA, SADAO, KITO, MAKOTO
Priority to US08/432,585 priority Critical patent/US5538383A/en
Application granted granted Critical
Publication of US5472305A publication Critical patent/US5472305A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/46—Gates or sluices, e.g. rotary wheels
    • B65G53/4608—Turnable elements, e.g. rotary wheels with pockets or passages for material
    • B65G53/4625—Turnable elements, e.g. rotary wheels with pockets or passages for material with axis of turning perpendicular to flow
    • B65G53/4633—Turnable elements, e.g. rotary wheels with pockets or passages for material with axis of turning perpendicular to flow the element having pockets, rotated from charging position to discharging position, i.e. discrete flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0203—Separating plastics from plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
    • B29K2033/18—Polymers of nitriles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2055/00—Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2023/00 - B29K2049/00, e.g. having a vinyl group, as moulding material
    • B29K2055/02—ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2059/00—Use of polyacetals, e.g. POM, i.e. polyoxymethylene or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2071/00—Use of polyethers, e.g. PEEK, i.e. polyether-etherketone or PEK, i.e. polyetherketone or derivatives thereof, as moulding material
    • B29K2071/12—PPO, i.e. polyphenylene oxide; PPE, i.e. polyphenylene ether
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B29L2009/005—Layered products coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3055—Cars
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the present invention relates to a rotary feeder, especially it is concerned with a sealed rotary feeder which can withstand a large pressure drop between its upstream and its downstream end.
  • thermosetting coating In the case of liquefying waste parts with a coating, the thermosetting coating is not decomposed. Therefore, the strength of the material is degraded when synthetic resins containing un-decomposed coatings are reused.
  • the strength of bumpers made of synthetic resins containing un-decomposed coatings is lower than that of bumpers made of synthetic resin without the coatings included.
  • coating can be mechanically removed by shotblasting etc., it not only takes a long time but is impossible to perfectly remove the coating when parts have complicated shapes. Mechanical removal, therefore, is unsuitable for mass recycling.
  • the present applicant has already proposed a method for recycling synthetic resin parts, that is, the coating thereof is hydrolyzed and kneaded into synthetic resin chips (See Japanese Patent Application No. 3-192431).
  • the above-mentioned method is a so-called batch process, and is not suitable for continuous recycle.
  • the sealing blades in the Prior Art are only inserted into a channel arranged on a rotor. Then when the supplied chips go into the clearance between the sealing blades and the channel, the sealing effect may be lost.
  • an object of the present invention is to provide a sealed rotary feeder allowing the use of an apparatus which continuously hydrolyzes chips made of synthetic resin with a coating under high pressure and temperature conditions without degrading the material strength.
  • the sealed rotary feeder of this invention comprises a casing having an inner cylindrical surface and a chip inlet intersecting said cylindrical surface at one location, and a chip outlet intersecting said cylindrical surface at a second location removed from said first location, and a rotor installed in said casing within said cylindrical surface, said rotor having plural walls which radially extend outwardly toward the inner cylindrical surface of said casing, a channel formed in the top of each of said plural walls, a blade movably positioned in each said channel, and a pressing means for pressing said blade against the inner cylindrical surface of said casing, and during rotation of said rotor at least two blades between said chip inlet and said chip outlet being simultaneously pressed against the inner cylindrical surface of said casing.
  • FIG. 1 is a flow-chart of a continuous recycling plant for waste parts made of synthetic resin having a coating thereon.
  • FIG. 2 is a sectional drawing of an apparatus for hydrolyzing.
  • FIG. 3 is a sectional drawing perpendicular to the axis of the first embodiment of a rotary feeder.
  • FIG. 4 is an axial structural drawing of the first embodiment.
  • FIG. 5 is a view of a rotor of the sealed rotary feeder.
  • FIG. 6 is an enlarged sectional drawing of the first embodiment of a seal blade.
  • FIG. 7 is an enlarged sectional drawing of the second embodiment of a seal blade.
  • FIG. 8 is an enlarged sectional drawing of the third embodiment of a seal blade.
  • FIGS. 9(a) and 9(b) are structural drawing of the first embodiment of the seal rotary feeder.
  • FIG. 10 is an axial structural drawing of the second embodiment.
  • FIG. 11 is a partial enlarged axial structural drawing of the second embodiment.
  • FIG. 12 is the first drawing of an inner surface of the side plate of the second embodiment.
  • FIG. 13 is the second drawing of an inner surface of the side plate of the second embodiment.
  • FIG. 14 is an enlarged sectional drawing of the third embodiment of the seal rotary feeder.
  • FIG. 15 is an enlarged sectional drawing of the third embodiment.
  • FIG. 16 is an enlarged sectional drawing of the fourth embodiment of the seal rotary feeder.
  • FIG. 17 is a drawing of an inner surface of the side plate of the fourth embodiment.
  • FIG. 1 is a flow-chart of continuous processing plant for waste parts made of synthetic resin having a coating thereon.
  • a waste part made of synthetic resin is, for example, a bumper 100 made of polypropylene (hereinafter referred to as PP) with a polyester melamine or a acrylic melamine coating on its surface.
  • PP polypropylene
  • the synthetic resin is not limited to PP, and it may be allowable that the synthetic resin is any one kind of thermoplastic resin such as denaturation polypropylene, polyethylene, ABS resin, AS resin, polyamide resin, polyester resin, polycarbonate resin, polyacetal resin, polyphenylene oxide and denaturation polyphenylene oxide.
  • thermoplastic resin such as denaturation polypropylene, polyethylene, ABS resin, AS resin, polyamide resin, polyester resin, polycarbonate resin, polyacetal resin, polyphenylene oxide and denaturation polyphenylene oxide.
  • the coating is any one kind of coating which can be hydrolyzed and decomposed to a low molecular weight compound, such as a urethane type or an amino resin type.
  • a crusher 110 consists of a coarse crusher 111 and a fine crusher 112. At first, a bumper 100 with paint film is crushed to standard bars, for example 30 cm length ⁇ 5 mm width ⁇ 5 mm thickness by the coarse crusher 111, and is further crushed to chips, for example 5 mm ⁇ 5 mm 5 mm cubes, by the fine crusher 112.
  • the chips are supplied to the first quantitative let-off apparatus 120.
  • This consists of a suction fan 12a, a transport pipe 12b, a cyclone 12c, a rotary feeder 12d, a stock bin 12e, a transport screw 12f and a measuring screw 12g.
  • chips are transported to the cyclone 12c though the transport pipe 12b by suction force of the suction fan 12a.
  • a belt conveyer can be applicable 10 instead of the transport pipe 12b.
  • Chips stored in the cyclone 12c are transported to the stock bin 12e by the rotary feeder 12d arranged at the bottom of the cyclone 12c.
  • Chips transported to the stock bin 12e are gathered to one side by the transport screw 12f arranged at the bottom of the stock bin 12e, and delivered to an apparatus for hydrolyzing by the measuring screw 12g.
  • This apparatus for hydrolyzing 130 consists of an upstream rotary feeder 131, a vessel 132 and a downstream rotary feeder 133.
  • the upstream rotary feeder 131 and the downstream rotary feeder 133 have same construction, and transport chips quantitatively. Namely, quantity of chips which are supplied from the upstream rotary feeder 131 to the vessel 132, or that which are delivered from the vessel 132 to the downstream rotary feeder 133 can be adjusted by the rotational speed of a rotor.
  • the vessel 132 is used for continuous hydrolyzing of the coating on the chips in steam while chips are transported from an inlet to an outlet by a screw.
  • chips are hydrolyzed for 0.5-2 hours in steam at 160° C., if the synthetic resin is PP.
  • An accelerator for hydrolyzing such as an acid or an alkali may be added.
  • each of chips After hydrolyzing, each of chips has a hydrolyzed and powdered coating around it.
  • Chips transported to an outlet are delivered by concavity 13b (FIG. 2) of the downstream rotary feeder 133, and supplied to a dryer apparatus 140.
  • the dryer apparatus 140 consists of dry furnace 141, a rotary feeder 142, a bag filter 143 and suction fan 144.
  • Superheated steam may be used to dry chips instead of a hot air blast.
  • an energy-saving can be accomplished by supplying steam which is released from the relief valves arranged on the vessel, and dehumidified and super-heated by a dehumidifier and superheater, because the hot blast stove can be omitted.
  • the chips stored at the bottom of the dry furnace 141 are delivered by the rotary feeder 142, and supplied to the second quantitative let-off apparatus 150.
  • This consists of a suction fan 15a, a transport pipe 15b, a cyclone 15c, a rotary feeder 15d, a stock bin 15e, a transport screw 15f and a measuring screw 15g similar to the first quantitative let-off apparatus 120.
  • This apparatus supplies chips to a kneader 160.
  • the kneader 160 consists of a biaxial kneader 161 and a extruding die 162.
  • the biaxial kneader 161 kneads the hydrolyzed coating, the size thereof being smaller than twenty or thirty ⁇ m, into chips.
  • Kneaded chips are extruded from the extruding die 162 which has holes each thereof, for example, 3 mm diameter, and supplied to a pelletizing apparatus 170.
  • the pelletizing apparatus 170 consists of a water tank for cooling 171 and a cutter 172.
  • Extruded synthetic resin is cooled in the water tank 171 to solidify and extruded synthetic resin is cut by the cutter 172 into pellets.
  • FIG. 2 shows the cross sectional drawing of the hydrolysis apparatus 130.
  • the rotor 13b is arranged so as to touch the casing 13a, and it does not allow high-temperature and high-pressure steam to leak from the hydrolyzing vessel 132 to the first quantitative let-off apparatus 120 arranged at the upstream of the hydrolyzing vessel.
  • the vessel 132 has a hollow shaft 13d along the axis of the cylindrical casing 13c.
  • a screw 13e is arranged so as to transport chips from the inlet 13f to the outlet 13g when the hollow shaft 13d is driven by a motor (not shown).
  • the temperature and pressure of the steam in the vessel 132 is controlled by the relief valve 13j connected to the steam outlet 13i.
  • FIG. 3 shows a sectional drawing perpendicular to the axis of the first embodiment of a rotary feeder which is arranged at the upstream of the vessel or its downstream
  • FIGS. 4 and 4(a) shows its axial sectional drawing.
  • the rotary feeder consists of a cylindrical casing 13a having a chip inlet 13a1 at its top and a chip outlet 13a2 at its bottom, eight blades 13k, and a rotor 13b having eight baskets 13l. And at least three blades 13k are pressed against the inner wall of the casing 13a.
  • FIG. 5 shows a three-dimensional view of the rotor 13b with alternately arranged blades 13k and baskets 13l. Chips supplied from the chip inlet 13a1 are stored in the basket 13l, transported to the chip outlet 13a2, and delivered quantitatively from the chip outlet 13a2. Note, the axial length of the basket is equal to that of the chip inlet and the chip outlet in order to improve efficiency.
  • sealant 13m is installed at the edge of the side plate 13n.
  • channels 13p the same length as the rotor 13b, are cut on its circumference, and blades 13k and springs 13q are inserted into the channels.
  • the force of each spring 13q is set in order to keep the blades touching against the inner wall when high pressure is applied to the blades 13k.
  • the diameter of the rotor 13b is determined so as to have a clearance H between the casing 13a even when the casing 13a is deformed by thermal expansion.
  • FIG. 6 shows the first method to stop steam flowing through the clearance (a) between the blades 13k and channels 13p. Blades 13k are supported by supporters 13r and movably installed.
  • Each blade 13k has a longitudinal slit 13k1 and a spring 13k2 in the slit 13k1 to spread it, and both sides of blade 13k touch to the channel 13p for sealing. Note, in FIG. 6 the spread of the blade is exaggerated.
  • FIG. 7 shows the second method of sealing, where two springs 13k3 and 13k4 are arranged on both sides of each blade 13k so that the blade 13k is slanted in the channel 13p.
  • each blade 13k is slanted by the two springs 13k3 and 13k4, and touch the top of the channel (a) and the inner wall of the channel (b). Note, in FIG. 7 the inclination of the blade is exaggerated.
  • FIG. 8 shows the third method of sealing, where an O ring 13s is arranged around the blade 13k.
  • the distance s between the top of the blade 13k and the position where the O ring 13s is arranged must be smaller than the height h (see FIG. 4) simultaneously to seal steam flow at the side and the circumference of the rotor. The following equation must be satisfied.
  • both sides of the blade 13k are always pressed against the inner wall of the casing 13a, and the wear of both sides is heavier than that of the center.
  • FIG. 9 shows the structural drawing to solve above-mentioned problem.
  • Two cut-outs 13t are arranged at the both sides of the blade 13k and rollers 13u are installed.
  • FIG. 10 shows the sectional drawing of the second embodiment of the rotary feeder according to the present invention
  • FIG. 11 shows a partial enlarged sectional drawing.
  • the chip inlet 13a1 is the high pressure side and the chip outlet 13a2 is the low pressure side.
  • Compressed air is introduced into the clearance 13p1 between the bottom of the channel 13p and the base of the blade 13k to increase the force on the blade 13k.
  • a side plate intake path 13n1 and a side plate exhaust path 13n2 are drilled on the side plate 13n.
  • a casing intake path 13a3, a casing intake groove 13a4, a casing exhaust groove 13a5 and a casing exhaust path 13a6 are formed on the casing side plate 13a7.
  • an exhaust hole 13a8 is also drilled on the casing 13a.
  • Wear of the blade 13k can be reduced, as only the force of the spring 13q acts upon the blade 13k.
  • FIG. 12 shows an inner plane of the casing side plate 13a7. On the inner surface of the casing side plate 13a7, two concentric seals 13a71 and 13a72 are embedded.
  • the side plate intake groove 13a4 is formed over one circular arc ⁇ , and compressed air is supplied from the side plate intake path 13a3.
  • the blades inside the circular arc ⁇ therefore, are strongly pressed against the inner wall of the casing by compressed air.
  • the side plate exhaust groove 13a5 is formed over the other circular arc ⁇ , and compressed air is exhausted to the side plate exhaust path 13a6.
  • the blades inside the second circular arc ⁇ therefore, are pressed only by the spring 13p.
  • FIG. 13 shows another inner plane of the casing side plate 13a7.
  • the second side plate exhaust groove 13a52 is arranged over a circular arc ⁇ 2 .
  • the circular arc ⁇ 2 corresponds to a range where the blades 13k exist on the chip outlet 13a2, and wear of the both sides of blades can be reduced by exhausting compressed air stored in the clearance 13p1 in this range. Note, in this case, the routes of the side plate intake path 13a3 and the side plate exhaust path 13a6 must be modified.
  • FIG. 14 shows the partial sectional drawing of the third embodiment, high pressure steam is used to press the blades 13k instead of compressed air. That is, the casing intake path 13a3 is opened to the chip outlet 13a2, and the casing exhaust hole is opened to the chip inlet 13a1.
  • High pressure steam at the chip outlet therefore, is introduced to the clearance 13p1 though the casing intake path 13a3, the casing intake groove 13a4 and the side plate intake path 13n1.
  • High pressure steam stored in the clearance 13p1 is exhausted to the chip inlet where steam pressure is low though the side plate exhaust path 13n2, the casing exhaust groove 13a5, the casing exhaust path 13a6, the cavity 13a9 and the casing exhaust hole 13a8.
  • both casing side plates shown in FIGS. 12 and 13 may be applied.
  • FIG. 15 shows the sectional drawing along 15--15 (in FIG. 14) of the third embodiment, the bottom width of the blade 13k A is determined larger than the top width B. Though steam in the chip outlet 13a2, therefore, is introduced, a force which acts on the bottom of the blade 13k is larger than that which acts on the top, and the blade 13k is strongly pressed against the inner surface of the casing 13a.
  • FIG. 16 shows the sectional drawing of the fourth embodiment, and a spring holder 13v is inserted at the bottom of each channel 13p. Springs 13q are fixed on the spring holder 13v, and the blade 13k is arranged on springs 13q.
  • the spring holder 13v extends through the side plates 13n, and a shoe 13v1 is arranged on the both sides of the spring holder 13v.
  • Each shoe 13v1 is engaged with the shoe groove 13a71 which is formed on the casing side plate 13a7, and the spring holder 13v can radially be moved following the shoe groove 13a71.
  • FIG. 17 shows the inner plane of the casing side plate 13a7.
  • the outer radius of the shoe groove 13a71 is r 1 over the circular arc ⁇ 1 and ⁇ 2 , and r 2 over the circular arc ⁇ 1 and ⁇ 2 . And over each circular arc ⁇ , the shoe groove 13a71 is formed so that the shoe groove 13a71 is smoothly connected.
  • Blades 13k which exist in the circular arc ⁇ 1 and ⁇ 2 , are strongly pressed, because the spring holder 13v is moved to the outside, springs 13q are compressed and the blades are pressed by springs.
  • Blades 13k which exist in the circular arc ⁇ 1 and ⁇ 2 , are weakly pressed, because the spring holder 13v is moved to the inside, and springs 13q are loosened.
  • the reason for reducing a press force over the circular arc ⁇ 2 is reducing wear of the blades, and the roller groove over the circular arc ⁇ 2 can be deleted to simplify the structure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
US08/093,883 1992-10-29 1993-07-20 Sealed rotary feeder Expired - Fee Related US5472305A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US08/432,585 US5538383A (en) 1992-10-29 1995-05-01 Sealed rotary feeder

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP4-291556 1992-10-29
JP29155692A JPH06134760A (ja) 1992-10-29 1992-10-29 シールロータリーフィーダ
JP4-295231 1992-11-04
JP29523192A JPH06143281A (ja) 1992-11-04 1992-11-04 シールロータリーフィーダ

Related Child Applications (1)

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US08/432,585 Division US5538383A (en) 1992-10-29 1995-05-01 Sealed rotary feeder

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US08/093,883 Expired - Fee Related US5472305A (en) 1992-10-29 1993-07-20 Sealed rotary feeder
US08/432,585 Expired - Fee Related US5538383A (en) 1992-10-29 1995-05-01 Sealed rotary feeder

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US (2) US5472305A (enrdf_load_stackoverflow)
EP (2) EP0718224B1 (enrdf_load_stackoverflow)
DE (2) DE69324505T2 (enrdf_load_stackoverflow)

Cited By (22)

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US5772081A (en) * 1996-06-04 1998-06-30 Food Industry Research And Development Institute Low leakage rotary valve
US6293439B1 (en) * 2000-07-20 2001-09-25 Chicago Conveyor Corporation High pressure valve
US20050279766A1 (en) * 2004-06-04 2005-12-22 Wiegner Thomas F Dispensing system and method of use
US20070138211A1 (en) * 2005-12-16 2007-06-21 O'leary Robert J Rotary valve for handling solid particulate material
US7712690B2 (en) 2006-10-16 2010-05-11 Owens Corning Intellectual Capital, Llc Exit valve for blowing insulation machine
US7731115B2 (en) 2006-10-16 2010-06-08 Owens Corning Intellectual Capital, Llc Agitation system for blowing insulation machine
US7762484B2 (en) 2008-04-14 2010-07-27 Owens Corning Intellectual Capital, Llc Blowing wool machine flow control
US7819349B2 (en) 2006-10-16 2010-10-26 Owens Corning Intellectual Capital, Llc Entrance chute for blowing insulation machine
US7845585B2 (en) 2006-10-16 2010-12-07 Owens Corning Intellectual Capital, Llc Blowing wool machine outlet plate assembly
US7882947B2 (en) 2006-10-16 2011-02-08 Owens Corning Intellectual Capital, Llc Partially cut loosefill package
US7886904B1 (en) 2009-07-30 2011-02-15 Owens Corning Intellectual Capital, Llc Loosefill package for blowing wool machine
US7913842B2 (en) 2006-10-16 2011-03-29 Owens Corning Intellectual Capital, Llc Loosefill package for blowing wool machine
US7938348B2 (en) 2004-07-27 2011-05-10 Owens Corning Intellectual Capital, Llc Loosefill blowing machine with a chute
US7971814B2 (en) 2008-12-17 2011-07-05 Owens Corning Intellectual Capital, Llc Non-symmetrical airlock for blowing wool machine
US8556129B1 (en) * 2011-03-09 2013-10-15 Gary Wayne Hirsch Powder dispenser assembly
US20130277399A1 (en) * 2012-04-20 2013-10-24 Coperion Gmbh Method for operating a cellular wheel sluice and cellular wheel sluice for carrying out the method
US9272287B2 (en) 2004-07-27 2016-03-01 Owens Corning Intellectual Capital Llc Blowing wool bag and method of using the bag
US9457355B2 (en) 2011-09-16 2016-10-04 Omachron Intellectual Property Inc. Apparatus for converting bales of insulation to loose fill
US20170002955A1 (en) * 2015-06-30 2017-01-05 Prater Industries, Inc. Rotary Valve Seal Pressure and Indicator System
CN109605523A (zh) * 2018-12-20 2019-04-12 象山谢海家具有限公司 家具制作边角料处理装置
US10794001B2 (en) * 2014-12-15 2020-10-06 Andritz Inc. Rotary feeder with recess for protective baffle and shear edge assembly
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Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5655853A (en) * 1994-12-14 1997-08-12 Wormser Systems, Inc. Vertical-shaft airlock
US5997220A (en) * 1994-12-14 1999-12-07 Wormser Systems, Inc. Vertical-shaft airlock
DE19751921C2 (de) 1997-11-22 2002-02-28 Coperion Waeschle Gmbh & Co Kg Zellenradschleuse
US6257820B1 (en) * 1999-02-05 2001-07-10 Fmc Corporation Atmospheric rotary feed and discharge turret valve and method
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DE102021125613A1 (de) 2021-10-04 2023-04-06 Fresenius Medical Care Deutschland Gmbh Vorrichtung zum Vereinzeln von Schüttgut

Citations (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB280253A (en) * 1926-05-17 1927-11-17 William Reavell Improvements in rotary compressors, exhausters and engines
US2492460A (en) * 1945-06-06 1949-12-27 Fmc Corp Valve for pressure treating chambers
US3052383A (en) * 1959-12-28 1962-09-04 Sherman T Transeau Rotary feeder mechanism
US3151784A (en) * 1961-10-24 1964-10-06 John P Tailor Rotary air lock
GB972715A (en) * 1961-12-11 1964-10-14 Simon Ltd Henry Improvements in rotary feeders for bulk material
US3201007A (en) * 1962-11-13 1965-08-17 Sherman T Transeau Rotary feeder mechanism
US3999905A (en) * 1975-11-17 1976-12-28 Caterpillar Tractor Co. Rotary mechanism
US4051212A (en) * 1974-09-04 1977-09-27 Bayer Aktiengesellschaft Process for the continuous degradation of plastics
US4098649A (en) * 1974-05-06 1978-07-04 Redker-Young Processes, Inc. Conversion of organic waste material
US4142868A (en) * 1978-05-02 1979-03-06 The United States Of America As Represented By The United States Department Of Energy Wear compensating seal means for rotary piston coal feeder
US4155486A (en) * 1977-10-25 1979-05-22 Brown Winfred E Rotary feeder
JPS55117438A (en) * 1979-02-28 1980-09-09 Tokyo Shibaura Electric Co Load selection controller
JPS55140528A (en) * 1979-04-23 1980-11-04 Neeben Kk Preparing for synthetic resin compound containing paint remnant
US4235354A (en) * 1975-11-18 1980-11-25 Kokkoman Shoyu Co., Ltd. Sealing structure for rotary valves
JPS586819A (ja) * 1981-07-06 1983-01-14 Mitsubishi Electric Corp 分離供給装置
US4496707A (en) * 1983-06-09 1985-01-29 Goodyear Aerospace Corporation Polyurethane and method for making stable components thereof
JPS63134421A (ja) * 1986-11-26 1988-06-07 Shohei Senda 粉粒体供給装置
US4784298A (en) * 1986-07-11 1988-11-15 Waeschle Maschinenfabrik Gmbh Apparatus for feeding bulk material
US4915265A (en) * 1987-12-15 1990-04-10 Waeschle Maschinenfabrik Gmbh Apparatus for feeding bulk material
JPH0395027A (ja) * 1989-09-01 1991-04-19 Sanko Air Plant Ltd 粉粒体の空気輸送用ロータリーフィーダー
DE3940667C1 (en) * 1989-12-08 1991-04-25 Waeschle Maschinenfabrik Gmbh, 7980 Ravensburg, De Sealed rotary valve assembly - incorporates cylindrical housing and seal elements in ends of rotor blades
JPH03195634A (ja) * 1989-12-22 1991-08-27 Sintokogio Ltd ロータリーフイーダ装置
US5215625A (en) * 1992-03-02 1993-06-01 Burton R Edward Method for producing articles from waste fiber, waste/surplus paint, and waste/surplus ink

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3758243A (en) * 1972-04-24 1973-09-11 Gen Motors Corp Rotary machine apex seal
US4410305A (en) * 1981-06-08 1983-10-18 Rovac Corporation Vane type compressor having elliptical stator with doubly-offset rotor
DE4008407A1 (de) * 1990-03-16 1991-09-19 Buehler Gmbh Zellenradschleuse
NO177899C (no) * 1993-03-26 1995-12-13 Hans Hiorth Trykktett sluse for innmating av pulvermateriale

Patent Citations (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB280253A (en) * 1926-05-17 1927-11-17 William Reavell Improvements in rotary compressors, exhausters and engines
US2492460A (en) * 1945-06-06 1949-12-27 Fmc Corp Valve for pressure treating chambers
US3052383A (en) * 1959-12-28 1962-09-04 Sherman T Transeau Rotary feeder mechanism
US3151784A (en) * 1961-10-24 1964-10-06 John P Tailor Rotary air lock
GB972715A (en) * 1961-12-11 1964-10-14 Simon Ltd Henry Improvements in rotary feeders for bulk material
US3201007A (en) * 1962-11-13 1965-08-17 Sherman T Transeau Rotary feeder mechanism
US4098649A (en) * 1974-05-06 1978-07-04 Redker-Young Processes, Inc. Conversion of organic waste material
US4051212A (en) * 1974-09-04 1977-09-27 Bayer Aktiengesellschaft Process for the continuous degradation of plastics
US3999905A (en) * 1975-11-17 1976-12-28 Caterpillar Tractor Co. Rotary mechanism
US4235354A (en) * 1975-11-18 1980-11-25 Kokkoman Shoyu Co., Ltd. Sealing structure for rotary valves
US4155486A (en) * 1977-10-25 1979-05-22 Brown Winfred E Rotary feeder
US4142868A (en) * 1978-05-02 1979-03-06 The United States Of America As Represented By The United States Department Of Energy Wear compensating seal means for rotary piston coal feeder
JPS55117438A (en) * 1979-02-28 1980-09-09 Tokyo Shibaura Electric Co Load selection controller
JPS55140528A (en) * 1979-04-23 1980-11-04 Neeben Kk Preparing for synthetic resin compound containing paint remnant
JPS586819A (ja) * 1981-07-06 1983-01-14 Mitsubishi Electric Corp 分離供給装置
US4496707A (en) * 1983-06-09 1985-01-29 Goodyear Aerospace Corporation Polyurethane and method for making stable components thereof
US4784298A (en) * 1986-07-11 1988-11-15 Waeschle Maschinenfabrik Gmbh Apparatus for feeding bulk material
JPS63134421A (ja) * 1986-11-26 1988-06-07 Shohei Senda 粉粒体供給装置
US4915265A (en) * 1987-12-15 1990-04-10 Waeschle Maschinenfabrik Gmbh Apparatus for feeding bulk material
JPH0395027A (ja) * 1989-09-01 1991-04-19 Sanko Air Plant Ltd 粉粒体の空気輸送用ロータリーフィーダー
DE3940667C1 (en) * 1989-12-08 1991-04-25 Waeschle Maschinenfabrik Gmbh, 7980 Ravensburg, De Sealed rotary valve assembly - incorporates cylindrical housing and seal elements in ends of rotor blades
JPH03195634A (ja) * 1989-12-22 1991-08-27 Sintokogio Ltd ロータリーフイーダ装置
US5215625A (en) * 1992-03-02 1993-06-01 Burton R Edward Method for producing articles from waste fiber, waste/surplus paint, and waste/surplus ink

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Communication dated Oct. 19, 1993 (1 page). *
European Search Report dated Oct. 6, 1993 (3 pages). *

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5772081A (en) * 1996-06-04 1998-06-30 Food Industry Research And Development Institute Low leakage rotary valve
US6293439B1 (en) * 2000-07-20 2001-09-25 Chicago Conveyor Corporation High pressure valve
US20050279766A1 (en) * 2004-06-04 2005-12-22 Wiegner Thomas F Dispensing system and method of use
US7938348B2 (en) 2004-07-27 2011-05-10 Owens Corning Intellectual Capital, Llc Loosefill blowing machine with a chute
US9272287B2 (en) 2004-07-27 2016-03-01 Owens Corning Intellectual Capital Llc Blowing wool bag and method of using the bag
US20070138211A1 (en) * 2005-12-16 2007-06-21 O'leary Robert J Rotary valve for handling solid particulate material
US7597219B2 (en) 2005-12-16 2009-10-06 Owens Corning Intellectual Capital, Llc Rotary valve for handling solid particulate material
US8245960B2 (en) 2006-10-16 2012-08-21 Owens Corning Intellectual Capital, Llc Agitation system for blowing wool machine
US7913842B2 (en) 2006-10-16 2011-03-29 Owens Corning Intellectual Capital, Llc Loosefill package for blowing wool machine
US7819349B2 (en) 2006-10-16 2010-10-26 Owens Corning Intellectual Capital, Llc Entrance chute for blowing insulation machine
US7845585B2 (en) 2006-10-16 2010-12-07 Owens Corning Intellectual Capital, Llc Blowing wool machine outlet plate assembly
US20110000990A1 (en) * 2006-10-16 2011-01-06 Johnson Michael W Entrance chute for blowing wool machine
US7882947B2 (en) 2006-10-16 2011-02-08 Owens Corning Intellectual Capital, Llc Partially cut loosefill package
US20100219274A1 (en) * 2006-10-16 2010-09-02 Johnson Michael W Agitation system for blowing wool machine
US9004382B2 (en) 2006-10-16 2015-04-14 Owens Corning Intellectual Capital, Llc Agitation system for blowing wool machine
US7712690B2 (en) 2006-10-16 2010-05-11 Owens Corning Intellectual Capital, Llc Exit valve for blowing insulation machine
US7731115B2 (en) 2006-10-16 2010-06-08 Owens Corning Intellectual Capital, Llc Agitation system for blowing insulation machine
US7980498B2 (en) 2006-10-16 2011-07-19 Owens-Corning Fiberglas Technology, Inc. Entrance chute for blowing wool machine
US20110174906A1 (en) * 2006-10-16 2011-07-21 Johnson Michael W Entrance chute for blowing wool machine
US20110226881A1 (en) * 2006-10-16 2011-09-22 Johnson Michael W Agitation system for blowing wool machine
US8087601B2 (en) 2006-10-16 2012-01-03 Owens Corning Intellectual Capital, Llc Agitation system for blowing wool machine
US7762484B2 (en) 2008-04-14 2010-07-27 Owens Corning Intellectual Capital, Llc Blowing wool machine flow control
US7971814B2 (en) 2008-12-17 2011-07-05 Owens Corning Intellectual Capital, Llc Non-symmetrical airlock for blowing wool machine
US7886904B1 (en) 2009-07-30 2011-02-15 Owens Corning Intellectual Capital, Llc Loosefill package for blowing wool machine
US8556129B1 (en) * 2011-03-09 2013-10-15 Gary Wayne Hirsch Powder dispenser assembly
US9457355B2 (en) 2011-09-16 2016-10-04 Omachron Intellectual Property Inc. Apparatus for converting bales of insulation to loose fill
US20130277399A1 (en) * 2012-04-20 2013-10-24 Coperion Gmbh Method for operating a cellular wheel sluice and cellular wheel sluice for carrying out the method
US10794001B2 (en) * 2014-12-15 2020-10-06 Andritz Inc. Rotary feeder with recess for protective baffle and shear edge assembly
US20170002955A1 (en) * 2015-06-30 2017-01-05 Prater Industries, Inc. Rotary Valve Seal Pressure and Indicator System
CN109605523A (zh) * 2018-12-20 2019-04-12 象山谢海家具有限公司 家具制作边角料处理装置
CN119460739A (zh) * 2024-11-22 2025-02-18 南通升辉机械有限公司 一种耐高温气压自动补偿式转卸料阀及其使用方法

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EP0718224A2 (en) 1996-06-26
EP0594949A1 (en) 1994-05-04
DE69324505T2 (de) 1999-11-18
DE69324505D1 (de) 1999-05-20
EP0718224A3 (enrdf_load_stackoverflow) 1996-07-31
DE69309844D1 (de) 1997-05-22
US5538383A (en) 1996-07-23
EP0718224B1 (en) 1999-04-14
DE69309844T2 (de) 1997-10-16
EP0594949B1 (en) 1997-04-16

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